Electrical connecting plug



A ril 13,1926. 1,580,503

' P. 'LAUTER ELECTRICAL CONNECTING PLUG Filed May 10, 1924 Patented Apr. 13,1926.

UNITED STATES PATENT OFFICE.

PHILIT LAUTER, OF NEW YORK, N. Y., ASSIGNOR TO POLYME'I. MANUFACTURING CORPORATION, A. CORPORATION OF NEW YORK.

ELECTRICAL coNNEc'rING PLUG.

Application filed. Kay 10, 1924. Serial No. 712,201.

To all whom it may concern:

Be it known that PHILIP LAU'IER, citlzen of the United States, residing at New York city, in the county of New York and State of New York, has invented certain new and useful Improvements in Electrical Connecting Plugs, of which the following is a specification.

This invention relates to electrical plug connectors.

An object of the invention is to provide a connector of the character described which shall form a terminal for telephone cords so as to co-operate with a telephone jack, and having practical and exceedingly simpleand inexpensive means for positively preventmg disconnection of the cord tips from the plug upon pulling the cord for disconnecting the plug.

A dominant feature of the invention resides in the construction of the plug body whereby simple means is provide ing the separate telephone cords to which the tips are secured enter'the" plug in crossed relation and at such an angle as tour e the tips into the plug upon an outwar pull on the cords, the prevention of disconnection of the tips being thus accomplished without requiring special mechanism or additional mechanical parts.

Other objects of this invention will'in part be obvious and in part hereinafter set forth.

The invention accordingly consists in the features of construction, combinations of ele ments and arrangement of parts which will be exemplified in the construction hereinafter described, and of which the scope of application will be indicated in the following claims.

In the accompanying drawing, in which is shown one of the various possible illus' trative embodiments of this invention,

Fig. 1 is a view in front elevation showing the exterior of a plug embodying the invention' Fig. 2 is a view in side elevation of the same, the body portion thereof being shown in section;

Fig. 8 is a view in front elevation of the lug with one-half of the plug body removed to, show the interior structure; and

for hav- Fig. 4: is a perspective view of the stem of the plug.

Referring in detail to the drawing, the

plug consists of a body portion 10 and a' stem 11 projecting therefrom having a tip 1:2 and a sleeve 13 adapted to be'inserted in a telephone jack in the well known manner. The tip 12 extends through and beyond the sleeve 13 as shown at 12 and may be insulated therefrom by means of aninsulating disc 14. A pair of outwardly diverging resilient contact members 15v and 16 extend from the inner *end of stem 11 and are securely fastened respectively to the said 'extended end 12 of tip 12 and sleeve 13 to make electrical connection therewith as shown in'Figs. 3 and 4. The contact member: may be insulated from each other as at 4.

The body 10 of the plug may preferably be formed of molded insulating material such as hard rubber or composition material and may consist of two indentic'al halves 10 and 10 fitted together to form a chamber for holding therein the end of stem 11 and the resilient members 15 and 16.

Extending from the end of the body member opposite the stem is an ear 10 having a longltudinal opening 19 for the purpose hereinafter described. A central groove 20 is formed in each of the innerfaces of the halves 10* and 10'? for receivin stem 11, and symmetrically disposed with reference to the longitudinal axis of the stem is a pair of grooves 22 and 22 at an acute angle to said axis for receiving the pin cord tips 21 and 21 at the ends of the telephone cords 20 and 20". The two faces the end of of the body may be secured together in any suitable manner, as for example by a central screw 17, and an imbedded nut 18.

In connecting the telephone cords to the plug, cords 20 and 20 are drawn through the opening 19 in crossed relation and the respective cord pin tips inserted into the corresponding grooves 22 and 22*, thus making contact respectively with the resilient contact members 15 and 16. Stops 23 and 23 at the bottom of each oove 22 and 22 may be provided as limiting means for the ends of pin tips 21 and 21 and to avoid possible short circuit of members 15 and 16 by tip 21". By reason of the angular relation of the grooves 22 and 22 to the axis of the stem 11, and by reason further of the drossed arrangement of the telephone cords 20 and 20 in the recess 19, it will be clear that an outward pull on the cord will have a component urging the pins 21* and 21 against the walls of their corresponding grooves 22 and 22*, thus preventing accldental disconnection of the cord tips without requiring any additional parts or,construction for positive interlocking between the cord tips and the contact members.

It will thus be seen that there is provided a device in which the several objects of this invention are achieved and which is well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, andas various changes might be made in the embodiment 'above set forth, it'is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim as new and desire to secure by Letters Patent V v 1. In a connecting plug a two part insulating body havin a recessed extension portion on each part t e recesses in said portlons forming a through opening and adapted to receive cord conductors, the adjacent faces on each part having spaced grooves adapted to receive a portion of a stem with contact members of a plug, and to form, when said parts are assembled, free passages and inlets, said assages and inlets adapted to have inserted t erein cord tips for holding same to the contact members, said passages being spaced on each side, of the axis through the stem and extending convergingly inward from their inlet ends towardthe axis for preventing accidental withdrawal of the cord tips therefrom on pullin the cord when the cord tips are in their e ective position with their respective conductor cords crossed through the recessed extension.

2. In a connecting plug, a two part insu-- lating bod havin a recessed extension ortion on eac part the recesses in said portions forming a through opening and adapted to receive cord conductors, the adjacent faces on each part having spaced grooves adapted to receive a portion of. a stem with contact members of a plug and to form, when said parts are assembled, free passages and inlets, said passages and inlets adapted to have inserted therein cord tips for holding same to'the contact members, said assages being spaced on'each side of the axis through the stem and extending conver ingly inward from their inlet ends toward the axis for preventing accidental withdrawal of the cords tips therefrom on pulling the cord insertion of cord tips for connection to said contact members, said body having an opening formed on the side opposite to the stem,

said opening extending transversely of an axis through the stem, said inlets to said passagesbeing positioned one at each side of the opening with the axis through the stem passing midway therebetween and said passages extending convergingly inward from the inlet ends toward the axis adapted to receive the cord tips on cord conductors crossed and drawn through said opening to 'prevent'accident-al withdrawal of the cord tips on pulling on said conductors to disconnect the plug.

- 4. In a connecting plug, a stem having resilient contact members formed at one end thereof, a body embracing a portion of the stem with the contact members, and having passages and inlets therefor adapted for the insertion of cord tips for connection to said contact members, said body having an opening formed on the side opposite to the stem, said opening extending transversely of an axis through the stem, said inlets to said passages being positioned one at each side of said opening with the axis through the stem passing midway therebetween, and said passages extending convergingly inward from the inlet ends toward the axis adapted to receive the cord tips on cold conductors crossed and drawn through the opening to prevent accidental withdrawal of the cord tips on pulling on said conductors to disconnect the plug, and stops formed at the ends of the passages opposite said inlets adapted to serve as limiting abutments for the cord tips and to avoid possible short circuit of the contact members.

5. In a connecting plug, a two part insulating body having a recessed extension portion on each part, the recesses in said portions forming a through opening adapted to receive cord conductors, the adjacent faces on each part having spaced grooves adapted to receive a portion. of a stem with contact members of the plug, and to form, when said parts are assembled, free passages and inlets, said passages and inlets adapted to have inserted therein cord tips for holding same to the contact members, said passages being spaced on each side of the axis through the stem and extending inwardly from their inlet ends toward the axis to co-operatei;with

\ said recessed extension for preventing accidental withdrawal of the, cord tips there- .from on pulling the cord wh'en'the cord tips are in. their effective position with their respective conductor cords crossed through the recessed extension.

- 6. Ina onnecti plug, a two part insulating body having a recessed extension portion on each part, the recesses in said, portio'ns forming a through opening adapted to receive cord conductors, the adjacent faces on each part havingsp-aced grooves adapted to. receive a portion of a stem with contact members ot a plug and to form, when said parts are assembled, free passages and inlets, said passages and inlets adapted to have inserted therein cord tips for holding same to the contact members, said passages being spaced on each side of the axis through the stem and extending inwardly from their in- .let ends toward the axis to co-operate with said recessed extension for. preventing accidental withdrawal of the cord tipstherepassages and inlets therefor adapted forthcinsertion of cord tips for connection to said contact members, said body having an opening formed on the side opposite to the stem, "said opening extending transversely of an axis through the stem, said inlets to said passages being positionedone at each' side of the opening with the axis through the stemv I passing midway therebetween, and mid passages extending inwardly from the inlet ends toward the axis} adapted to receive the cord tips on cord conductors crossed and drawn through said opening to preventaccidental withdrawal of the cord'tlps on pulling on said conductors to disconnect the plug.

8. In a connecting plug, a stem having resilient contact members formed at one end thereof, a body embracing a portion of the stem with the contact members, and having passages and'inlets therefor adapted -;for the insert on of-cord tips for connection to said contactinembers, said body having an open ing formed on the side opposite to the stem, said opening-extending transversely of an axis through the stem, said inlets to said passages being positioned one at each side of said opening with the axis through the stem passing midway therebetween, and said passages extending inwardly from the inlet ends towardthe axis adapted to receive-,the cord.

tips on cord conductors crossed and drawn through the opening-to prevent accidental.

withdrawal of the cord tips on pulling on said conductors to disconnect the plug, and

' stops formed at the ends of the passages opposite saidinlets adapted to serve as limiting abutments for the cord tips and to avoid' possible short circuit of the contact members.

In testimony whereof I afiix my signature.

j ILIP LAUTER. 

